Device for straining waste water.



O- SUHUMANN.

' DEVICE FOR STRAINING WASTE WATER. APPLICATION FILED JULY 18', 1902.

914,758. Patented Mar. 9, 1909.

OTTo S CHUMAN N,

Atterneg.

[lire/1% orr'o SGHUMANN, or DRESDEN, GERMANY.

DEVICE FOR STRAINING WASTE WATER.

I Specification of Letters Patent.

Patented March 9,1909.

Application filed July 18, 1908. Serial No. 444,233.

To all whom it may concern.

Be it known that I, O'rro SGHUMANN, a citizen of the German Empire, andresident of Dresden A, Saxony, German Empire, have invented new anduseful Improved Devices for Straining Waste Water, of which thefollowing is a description.

The present invention relates to 'rotar filter sieves or screens forstraining and purifying Waste Water and its object is to so arrange thescreen or strainer that the greater part of its area shall be immersedin the water to be strained, thus rendering the sieve more effective andalso tendingto sort the filterings according to their specific gravity.These objects areattained by making the sieve of a conical shape orsubstantiall conical and mounting it on an axis or she t inclined towardthe oniiowing waste water, sewage or the like.

In order to render the present specification easily intelligiblereference is had to the accompanying drawing in which similar letters ofreference denote similar parts throughout the several views:

Figure 1 isa central vertical longitudinal section through the apparatusand Fig. 2 is a plan view of the same.

The waste water sewage or the like flows into the it c at the inflow aand passing through the screen d passes out of the pit at he screen clis substantially conical in form and is modnted on the inclined shaft cin such manner that the highest section of its surface shall be in aplane just above the level of the water. As shown in the drawings thesurface of the screen which is above the water is represented by theline y 1 but' it might be much smaller as indicated by the line 2 2(Fig. 2). The screen is provided with a rim of teeth 9 by means of whichit is 1'0- tated b suitable gearing and the pinion h. Along t resurfacewhich extends out of the water suitable means are mounted for clearmgaway'the 1m uritles strained out of the water.

In the (rawing a chain of buckets t is re resented, which may be movedradially a ong the conical screen and will trans-' port the impuritiesoff the same on to the inclined surface 7c, which passes them on to theverticall moving bucket chain Z or any other suitab e device.

At the bottom'of the housing a scumbr mud pit a is laterally dis osed,into which the heavier impurities wil be forced by the rotation of thescreen, and into which furthermore a vertical elevator or bucket chain mextends for raising the contents of the same. v

v The shape and disposition of the conical screen of t e presentinvention enables practically the whole of the sieve to be immersed,

while it has the additional advantage that the surface which meets theoncomin water is most sharply mchned. This resu ts in a sorting of theimpurities strained off according to theirspeclfic gravity, the'veryheavy parts being rotation of t ing disposed farther from or nearer tothe pushed into the mud pithy the e screen and the other parts be centerof. the latter according as to whether they are of a heavier or lighternature, the heavier parts lying toward the edges or encumference of thescreen.

In the drawings I have illustrated an em! bodiment of the invention, butthis arrange ment could be varied in many ways without departing fromthe spirit of the invention. It will be readily understood that thesurface of the screen extending out of the Water need not be necessarilyabsolutely parallelto the surface of the water.

I claim as my invention 1. In a device for straining waste water and thelike, the combination of a suitable pit having waste water inletandstrained water outlet, a conical screen, an inclined axis on which thesaid screen is mounted to rotate, the said screen having-its uppermostsurface substantially parallel with the water level and extending out ofthe same.

2. In a 'device for straining waste water and the like, the combinationof a suitable pit having Waste water inlet, and strained Water outlet, aconical screen an inclined axis on which the said screen is mounted torotate, the said screen having its uppermost surface substantiallyparallel with the water level and extending out of the same, and meansis J water outlet, acoincnl screen an inclined axis of the screen andmeans for removmg the.

on Whichthc, snid screen is mounted to rotate, the saicl screen havingits uppcrniostsurface substantially parallel with the water level andextending out Of the same, means for removing impurities from the partof the screen extending out of ti 1e water, a scum pit formed at thelowest point of the screen pit,'leterally im urities therefrom, 10

' n testimony whereof aflix my signature in the presence of twoWitnesses.

OTTO SCHUMANN. Witnesses:

RICHARD IFFERTE, PAUL LIENEMANN;

